New to me 1500. The speedo needle flutters about 1/4" at any speed. Still reads correct speed at the bottom end of the flutter. I am assuming my speedo gearing or cable is going out..any thing I can do to fix it or at least extend it's life..lube, tighten or check something.

I had the same issue until the speddo stopped working, then the crusie will not work (FYI)
I was able to remove the front wheel clean the speedo adaptorand I what i also did was to change the cable, but what i did was slide the new internal wire back in the old casing and it worked perfect. It is a job to get the cable out and get to the back of speddo (so I have read) I cleanded and and greased the cable and housing and all worked great. Good luck